The mutation that would be passed on to living offspring if it happened in a parent is:
an insertion mutation in a gamete that deactivates a gene for hair color.
Mutations in gametes (sperm or egg cells) can be inherited by offspring, while mutations in somatic cells (body cells) cannot. Silent mutations do not affect the protein produced and are generally not passed on in a meaningful way. A chromosomal deletion that affects blood function may be inherited if it occurs in a gamete, but the option specifically mentioned likely signifies a somatic mutation as well since it talks about the ability of blood to carry oxygen, which is typically a trait that involves multiple genes and not easily translated into a single inheritable mutation context. Therefore, the first option is the most appropriate answer.